Expose "backend" InSpec configuration option

[walterdolce]

Hi,
While trying to directly use kitchen-inspec as a verifier over the one being used by kitchen-terraform instead, I found myself needing to provide the backend option to InSpec but this is not currently exposed and so it can't be passed in the .kitchen.yml file.

A quick search in GitHub and in the code shows the backend_cache option is exposed, though:
https://github.com/inspec/kitchen-inspec/search?q=backend&unscoped_q=backend

Am I right in assuming this config opton is currently not exposed because nobody asked for it and/or had a use case before now? :)

Thank you.

[clintoncwolfe]

I beleive this can be closed, as the underlying need on the kitchen-terraform project was addressed differently - see newcontext-oss/kitchen-terraform#252 (comment)